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B A
B A
TTERIES
TTERIES
B A TTERIES
B A
B A
TTERIES
TTERIES
To achieve 50% cycling you should
calculate your Amp-hour consumption
between charging cycles and use a battery
bank with twice that capacity**. Each AC
appliance or tool has a rating plate on it and will
b e r a t e d i n e i t h e r AC Amps or Wa t t s o r AC VA
(Volt-Amps) apparent power. To calculate Amp-
hour consumption, use one of the formulas to
the right to calculate the DC Amp-hour draw
for a 12 volt system.
Calculate the Amp-hours for every AC
appliance or tool that will be operated on the
i n v e r t e r. This will provide the total number of
Amp-hours used between recharges. Size the
battery bank using this number as a guideline.
A good rule to follow is to size the battery bank
a minimum of 2 times larger than the
total Amp-hour load requirement. Plan on
recharging when 50% discharged.
**Batteries are typically charged to 85% of full
charge when charging with alternators without 3-stage
regulators.
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AMP-HOUR CONSUMPTION FORMULAS
AMP-HOUR CONSUMPTION FORMULAS
AMP-HOUR CONSUMPTION FORMULAS
AMP-HOUR CONSUMPTION FORMULAS
AMP-HOUR CONSUMPTION FORMULAS
(AC Amps x 10) x 1.1 x hours of
(AC Amps x 10) x 1.1 x hours of
(AC Amps x 10) x 1.1 x hours of
(AC Amps x 10) x 1.1 x hours of
(AC Amps x 10) x 1.1 x hours of
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
(Watts/ DC V
(W
(W
(W
(W
atts/ DC V
atts/ DC Voltage) x 1.1 x hours of
atts/ DC V
atts/ DC V
oltage) x 1.1 x hours of
oltage) x 1.1 x hours of
oltage) x 1.1 x hours of
oltage) x 1.1 x hours of
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
(AC V
(AC V
A/ DC V
A/ DC V
oltage) x 1.1 x hours of
oltage) x 1.1 x hours of
(AC V
(AC V
(AC VA/ DC V
A/ DC Voltage) x 1.1 x hours of
A/ DC V
oltage) x 1.1 x hours of
oltage) x 1.1 x hours of
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
operation = DC Amp-hours
DC Voltage is 12, 24 or 32 depending on
your system.
In all formulas, 1.1 is the correction factor for
inverter efficiency.
T T T T T ypical Power Consumptlon
ypical Power Consumptlon
ypical Power Consumptlon
ypical Power Consumptlon
ypical Power Consumptlon
The chart identifies typical power
consumption for common AC loads. Use it as
a guide when identifying your power
requirements.
Many electric motors have
momentary starting require-
ments well above their opera-
tional rating. Start up watts are
listed where appropriate.
m
p
H
o
u
s r
Individual styles and brands of
3
H
. r
8
H
. r
2
4
H
. r
appliances may vary.
1
2
3
2
9
6
2
4
6
4
1
9
2
1
2
3
2
9
6
bank for the inverter and other
DC loads, be sure to consider
2
4
6
4
1
9
2
the power consumption of the
DC loads when sizing the
battery bank.
1
5
6 .
4
1
6 .
8
3
2 .
1
2
3
2
9
6
1
2
6
3
3
6
6
7
2
1
8
0
3
6
0
N O T E
N O T E
N O T E Certain laser printers, breadmakers,
N O T E
N O T E
2
6
4
digital clocks and appliance/tool chargers
v
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o i
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s
c
o
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u
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u
s
u r
n
t
m i
e
s
.
may not operate on modified sine wave.
y
e l
.
If using the same battery
Part No. 90-0123-00
Libertycombi.p65 11/05/99
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